Mothers of Supertwins (MOST)http://www.mostonline.orgMOST is a support network of families who have or are expecting triplets, quadruplets, or more.

Twin Stuffhttp://www.twinstuff.comA site created by twins for twins that provides twins, other multiples, and their families a look at why it's special to be a twin. The site also offers links to other sites about multiples.